igmp.c File Reference

#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>

Go to the source code of this file.

Defines
#define	IP_MAX_MEMBERSHIPS   20
Functions
void	ip_mc_clear_src (struct ip_mc_list *pmc)
int	ip_mc_add_src (struct in_device *in_dev, __u32 *pmca, int sfmode, int sfcount, __u32 *psfsrc, int delta)
void	ip_ma_put (struct ip_mc_list *im)
void	ip_mc_filter_add (struct in_device *in_dev, u32 addr)
void	ip_mc_filter_del (struct in_device *in_dev, u32 addr)
void	igmp_group_dropped (struct ip_mc_list *im)
void	igmp_group_added (struct ip_mc_list *im)
void	ip_mc_inc_group (struct in_device *in_dev, u32 addr)
void	ip_mc_dec_group (struct in_device *in_dev, u32 addr)
void	ip_mc_down (struct in_device *in_dev)
void	ip_mc_up (struct in_device *in_dev)
void	ip_mc_destroy_dev (struct in_device *in_dev)
in_device *	ip_mc_find_dev (struct ip_mreqn *imr)
int	ip_mc_del1_src (struct ip_mc_list *pmc, int sfmode, __u32 *psfsrc)
int	ip_mc_del_src (struct in_device *in_dev, __u32 *pmca, int sfmode, int sfcount, __u32 *psfsrc, int delta)
int	ip_mc_add1_src (struct ip_mc_list *pmc, int sfmode, __u32 *psfsrc, int delta)
int	ip_mc_join_group (struct sock *sk, struct ip_mreqn *imr)
int	ip_mc_leave_src (struct sock *sk, struct ip_mc_socklist *iml, struct in_device *in_dev)
int	ip_mc_leave_group (struct sock *sk, struct ip_mreqn *imr)
int	ip_mc_source (int add, int omode, struct sock *sk, struct ip_mreq_source *mreqs, int ifindex)
int	ip_mc_msfilter (struct sock *sk, struct ip_msfilter *msf, int ifindex)
int	ip_mc_msfget (struct sock *sk, struct ip_msfilter *msf, struct ip_msfilter *optval, int *optlen)
int	ip_mc_gsfget (struct sock *sk, struct group_filter *gsf, struct group_filter *optval, int *optlen)
int	ip_mc_sf_allow (struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
void	ip_mc_drop_socket (struct sock *sk)
int	ip_check_mc (struct in_device *in_dev, u32 mc_addr, u32 src_addr)
int	ip_mc_procinfo (char *buffer, char **start, off_t offset, int length)
int	ip_mcf_procinfo (char *buffer, char **start, off_t offset, int length)
Variables
int	sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS

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Define Documentation

#define IP_MAX_MEMBERSHIPS   20

Definition at line 104 of file igmp.c.

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Function Documentation

void igmp_group_added (  struct ip_mc_list *  im  )  [static]

Definition at line 1072 of file igmp.c. References ip_mc_filter_add(), and in_device::mr_qrv. Referenced by ip_mc_inc_group(), and ip_mc_up(). { struct in_device *in_dev = im->interface; if (im->loaded == 0) { im->loaded = 1; ip_mc_filter_add(in_dev, im->multiaddr); } #ifdef CONFIG_IP_MULTICAST if (im->multiaddr == IGMP_ALL_HOSTS) return; if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { spin_lock_bh(&im->lock); igmp_start_timer(im, IGMP_Initial_Report_Delay); spin_unlock_bh(&im->lock); return; } /* else, v3 */ im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; igmp_ifc_event(in_dev); #endif }

void igmp_group_dropped (  struct ip_mc_list *  im  )  [static]

Definition at line 1035 of file igmp.c. References in_device::dev, net_device::flags, ip_mc_clear_src(), and ip_mc_filter_del(). Referenced by ip_mc_dec_group(), ip_mc_destroy_dev(), and ip_mc_down(). { struct in_device *in_dev = im->interface; #ifdef CONFIG_IP_MULTICAST int reporter; #endif if (im->loaded) { im->loaded = 0; ip_mc_filter_del(in_dev, im->multiaddr); } #ifdef CONFIG_IP_MULTICAST if (im->multiaddr == IGMP_ALL_HOSTS) return; reporter = im->reporter; igmp_stop_timer(im); if (in_dev->dev->flags & IFF_UP) { if (IGMP_V1_SEEN(in_dev)) goto done; if (IGMP_V2_SEEN(in_dev)) { if (reporter) igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); goto done; } /* IGMPv3 */ igmpv3_add_delrec(in_dev, im); igmp_ifc_event(in_dev); } done: #endif ip_mc_clear_src(im); }

int ip_check_mc (  struct in_device *  in_dev, u32  mc_addr, u32  src_addr )

Definition at line 2056 of file igmp.c. References in_device::lock, in_device::mc_list, MCAST_EXCLUDE, and MCAST_INCLUDE. Referenced by ip_route_input(), and ip_route_output_slow(). { struct ip_mc_list *im; struct ip_sf_list *psf; int rv = 0; read_lock(&in_dev->lock); for (im=in_dev->mc_list; im; im=im->next) { if (im->multiaddr == mc_addr) break; } /* * This should check the protocol and allow all IGMP packets * here, but it isn't available in the call from ip_route_output() * in 2.4.x. It shouldn't actually matter, since groups joined * from within the kernel will have an {exclude, empty} filter. * Differs from 2.5.x here. +-DLS 4/23/03 */ if (im) { for (psf=im->sources; psf; psf=psf->sf_next) { if (psf->sf_inaddr == src_addr) break; } if (psf) rv = psf->sf_count[MCAST_INCLUDE] || psf->sf_count[MCAST_EXCLUDE] != im->sfcount[MCAST_EXCLUDE]; else rv = im->sfcount[MCAST_EXCLUDE] != 0; } read_unlock(&in_dev->lock); return rv; }

void ip_ma_put (  struct ip_mc_list *  im  )  [static]

Definition at line 140 of file igmp.c. References in_dev_put(). Referenced by ip_mc_dec_group(), and ip_mc_destroy_dev(). { if (atomic_dec_and_test(&im->refcnt)) { in_dev_put(im->interface); kfree(im); } }

int ip_mc_add1_src (  struct ip_mc_list *  pmc, int  sfmode, __u32 *  psfsrc, int  delta )  [static]

Definition at line 1418 of file igmp.c. References ip_rt_multicast_event(). Referenced by ip_mc_add_src(). { struct ip_sf_list *psf, *psf_prev; psf_prev = 0; for (psf=pmc->sources; psf; psf=psf->sf_next) { if (psf->sf_inaddr == *psfsrc) break; psf_prev = psf; } if (!psf) { psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); if (!psf) return -ENOBUFS; memset(psf, 0, sizeof(*psf)); psf->sf_inaddr = *psfsrc; if (psf_prev) { psf_prev->sf_next = psf; } else pmc->sources = psf; } psf->sf_count[sfmode]++; if (psf->sf_count[sfmode] == 1) { ip_rt_multicast_event(pmc->interface); } return 0; }

int ip_mc_add_src (  struct in_device *  in_dev, __u32 *  pmca, int  sfmode, int  sfcount, __u32 *  psfsrc, int  delta )

Definition at line 1488 of file igmp.c. References ip_mc_add1_src(), ip_mc_del1_src(), in_device::lock, in_device::mc_list, MCAST_EXCLUDE, MCAST_INCLUDE, in_device::mr_ifc_count, and in_device::mr_qrv. Referenced by ip_mc_inc_group(), ip_mc_msfilter(), and ip_mc_source(). { struct ip_mc_list *pmc; int isexclude; int i, err; if (!in_dev) return -ENODEV; read_lock(&in_dev->lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { if (*pmca == pmc->multiaddr) break; } if (!pmc) { /* MCA not found?? bug */ read_unlock(&in_dev->lock); return -ESRCH; } spin_lock_bh(&pmc->lock); read_unlock(&in_dev->lock); #ifdef CONFIG_IP_MULTICAST sf_markstate(pmc); #endif isexclude = pmc->sfmode == MCAST_EXCLUDE; if (!delta) pmc->sfcount[sfmode]++; err = 0; for (i=0; i<sfcount; i++) { err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); if (err) break; } if (err) { int j; pmc->sfcount[sfmode]--; for (j=0; j<i; j++) (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { #ifdef CONFIG_IP_MULTICAST struct in_device *in_dev = pmc->interface; struct ip_sf_list *psf; #endif /* filter mode change */ if (pmc->sfcount[MCAST_EXCLUDE]) pmc->sfmode = MCAST_EXCLUDE; else if (pmc->sfcount[MCAST_INCLUDE]) pmc->sfmode = MCAST_INCLUDE; #ifdef CONFIG_IP_MULTICAST /* else no filters; keep old mode for reports */ pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; in_dev->mr_ifc_count = pmc->crcount; for (psf=pmc->sources; psf; psf = psf->sf_next) psf->sf_crcount = 0; igmp_ifc_event(in_dev); } else if (sf_setstate(pmc)) { igmp_ifc_event(in_dev); #endif } spin_unlock_bh(&pmc->lock); return err; }

void ip_mc_clear_src (  struct ip_mc_list *  pmc  )  [static]

Definition at line 1556 of file igmp.c. References MCAST_EXCLUDE. Referenced by igmp_group_dropped(). { struct ip_sf_list *psf, *nextpsf; for (psf=pmc->tomb; psf; psf=nextpsf) { nextpsf = psf->sf_next; kfree(psf); } pmc->tomb = 0; for (psf=pmc->sources; psf; psf=nextpsf) { nextpsf = psf->sf_next; kfree(psf); } pmc->sources = 0; pmc->sfmode = MCAST_EXCLUDE; pmc->sfcount[MCAST_EXCLUDE] = 0; pmc->sfcount[MCAST_EXCLUDE] = 1; }

void ip_mc_dec_group (  struct in_device *  in_dev, u32  addr )

Definition at line 1168 of file igmp.c. References in_device::dev, net_device::flags, igmp_group_dropped(), ip_ma_put(), ip_rt_multicast_event(), in_device::lock, and in_device::mc_list. Referenced by ip_mc_down(), ip_mc_drop_socket(), and ip_mc_leave_group(). { struct ip_mc_list *i, **ip; ASSERT_RTNL(); for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { if (i->multiaddr==addr) { if (--i->users == 0) { write_lock_bh(&in_dev->lock); *ip = i->next; write_unlock_bh(&in_dev->lock); igmp_group_dropped(i); if (in_dev->dev->flags & IFF_UP) ip_rt_multicast_event(in_dev); ip_ma_put(i); return; } break; } } }

int ip_mc_del1_src (  struct ip_mc_list *  pmc, int  sfmode, __u32 *  psfsrc )  [static]

Definition at line 1307 of file igmp.c. References ip_rt_multicast_event(), MCAST_EXCLUDE, MCAST_INCLUDE, and in_device::mr_qrv. Referenced by ip_mc_add_src(), and ip_mc_del_src(). { struct ip_sf_list *psf, *psf_prev; int rv = 0; psf_prev = 0; for (psf=pmc->sources; psf; psf=psf->sf_next) { if (psf->sf_inaddr == *psfsrc) break; psf_prev = psf; } if (!psf || psf->sf_count[sfmode] == 0) { /* source filter not found, or count wrong => bug */ return -ESRCH; } psf->sf_count[sfmode]--; if (psf->sf_count[sfmode] == 0) { ip_rt_multicast_event(pmc->interface); } if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { #ifdef CONFIG_IP_MULTICAST struct in_device *in_dev = pmc->interface; #endif /* no more filters for this source */ if (psf_prev) psf_prev->sf_next = psf->sf_next; else pmc->sources = psf->sf_next; #ifdef CONFIG_IP_MULTICAST if (psf->sf_oldin && !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; psf->sf_next = pmc->tomb; pmc->tomb = psf; rv = 1; } else #endif kfree(psf); } return rv; }

int ip_mc_del_src (  struct in_device *  in_dev, __u32 *  pmca, int  sfmode, int  sfcount, __u32 *  psfsrc, int  delta )

Definition at line 1352 of file igmp.c. References ip_mc_del1_src(), in_device::lock, in_device::mc_list, MCAST_EXCLUDE, MCAST_INCLUDE, in_device::mr_ifc_count, and in_device::mr_qrv. Referenced by ip_mc_leave_src(), ip_mc_msfilter(), and ip_mc_source(). { struct ip_mc_list *pmc; int changerec = 0; int i, err; if (!in_dev) return -ENODEV; read_lock(&in_dev->lock); for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { if (*pmca == pmc->multiaddr) break; } if (!pmc) { /* MCA not found?? bug */ read_unlock(&in_dev->lock); return -ESRCH; } spin_lock_bh(&pmc->lock); read_unlock(&in_dev->lock); #ifdef CONFIG_IP_MULTICAST sf_markstate(pmc); #endif if (!delta) { err = -EINVAL; if (!pmc->sfcount[sfmode]) goto out_unlock; pmc->sfcount[sfmode]--; } err = 0; for (i=0; i<sfcount; i++) { int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); changerec |= rv > 0; if (!err && rv < 0) err = rv; } if (pmc->sfmode == MCAST_EXCLUDE && pmc->sfcount[MCAST_EXCLUDE] == 0 && pmc->sfcount[MCAST_INCLUDE]) { #ifdef CONFIG_IP_MULTICAST struct ip_sf_list *psf; #endif /* filter mode change */ pmc->sfmode = MCAST_INCLUDE; #ifdef CONFIG_IP_MULTICAST pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : IGMP_Unsolicited_Report_Count; in_dev->mr_ifc_count = pmc->crcount; for (psf=pmc->sources; psf; psf = psf->sf_next) psf->sf_crcount = 0; igmp_ifc_event(pmc->interface); } else if (sf_setstate(pmc) || changerec) { igmp_ifc_event(pmc->interface); #endif } out_unlock: spin_unlock_bh(&pmc->lock); return err; }

void ip_mc_destroy_dev (  struct in_device *  in_dev  )

Definition at line 1252 of file igmp.c. References igmp_group_dropped(), ip_ma_put(), in_device::lock, and in_device::mc_list. Referenced by inetdev_destroy(). { struct ip_mc_list *i; ASSERT_RTNL(); write_lock_bh(&in_dev->lock); while ((i = in_dev->mc_list) != NULL) { in_dev->mc_list = i->next; write_unlock_bh(&in_dev->lock); igmp_group_dropped(i); ip_ma_put(i); write_lock_bh(&in_dev->lock); } write_unlock_bh(&in_dev->lock); }

void ip_mc_down (  struct in_device *  in_dev  )

Definition at line 1195 of file igmp.c. References __in_dev_put, igmp_group_dropped(), ip_mc_dec_group(), in_device::mc_list, in_device::mr_gq_running, in_device::mr_gq_timer, in_device::mr_ifc_count, and in_device::mr_ifc_timer. Referenced by inetdev_event(). { struct ip_mc_list *i; ASSERT_RTNL(); #ifdef CONFIG_IP_MULTICAST in_dev->mr_ifc_count = 0; if (del_timer(&in_dev->mr_ifc_timer)) __in_dev_put(in_dev); in_dev->mr_gq_running = 0; if (del_timer(&in_dev->mr_gq_timer)) __in_dev_put(in_dev); #endif for (i=in_dev->mc_list; i; i=i->next) igmp_group_dropped(i); #ifdef CONFIG_IP_MULTICAST igmpv3_clear_delrec(in_dev); #endif ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); }

void ip_mc_drop_socket (  struct sock *  sk  )

Definition at line 2032 of file igmp.c. References in_dev_put(), inetdev_by_index(), ip_mc_dec_group(), ip_mc_leave_src(), in_device::mc_list, sock::protinfo, rtnl_lock(), rtnl_unlock(), and sock_kfree_s(). Referenced by inet_release(). { struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_mc_socklist *iml; if (inet->mc_list == NULL) return; rtnl_lock(); while ((iml = inet->mc_list) != NULL) { struct in_device *in_dev; inet->mc_list = iml->next; if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { (void) ip_mc_leave_src(sk, iml, in_dev); ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); in_dev_put(in_dev); } sock_kfree_s(sk, iml, sizeof(*iml)); } rtnl_unlock(); }

void ip_mc_filter_add (  struct in_device *  in_dev, u32  addr )  [static]

Definition at line 902 of file igmp.c. References net_device::addr_len, arp_mc_map(), in_device::dev, dev_mc_add(), and MAX_ADDR_LEN. Referenced by igmp_group_added(). { char buf[MAX_ADDR_LEN]; struct net_device *dev = in_dev->dev; /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. We will get multicast token leakage, when IFF_MULTICAST is changed. This check should be done in dev->set_multicast_list routine. Something sort of: if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } --ANK */ if (arp_mc_map(addr, buf, dev, 0) == 0) dev_mc_add(dev,buf,dev->addr_len,0); }

void ip_mc_filter_del (  struct in_device *  in_dev, u32  addr )  [static]

Definition at line 922 of file igmp.c. References net_device::addr_len, arp_mc_map(), in_device::dev, dev_mc_delete(), and MAX_ADDR_LEN. Referenced by igmp_group_dropped(). { char buf[MAX_ADDR_LEN]; struct net_device *dev = in_dev->dev; if (arp_mc_map(addr, buf, dev, 0) == 0) dev_mc_delete(dev,buf,dev->addr_len,0); }

struct in_device* ip_mc_find_dev (  struct ip_mreqn *  imr  )  [static]

Definition at line 1271 of file igmp.c. References __dev_put, __in_dev_get(), __in_dev_put, net_device::ifindex, ip_mreqn::imr_address, ip_mreqn::imr_ifindex, ip_mreqn::imr_multiaddr, inetdev_by_index(), ip_dev_find(), ip_route_output(), ip_rt_put(), and in_addr::s_addr. Referenced by ip_mc_join_group(), ip_mc_msfget(), ip_mc_msfilter(), and ip_mc_source(). { struct rtable *rt; struct net_device *dev = NULL; struct in_device *idev = NULL; if (imr->imr_ifindex) { idev = inetdev_by_index(imr->imr_ifindex); if (idev) __in_dev_put(idev); return idev; } if (imr->imr_address.s_addr) { dev = ip_dev_find(imr->imr_address.s_addr); if (!dev) return NULL; __dev_put(dev); } if (!dev && !ip_route_output(&rt, imr->imr_multiaddr.s_addr, 0, 0, 0)) { dev = rt->u.dst.dev; ip_rt_put(rt); } if (dev) { imr->imr_ifindex = dev->ifindex; idev = __in_dev_get(dev); } return idev; }

int ip_mc_gsfget (  struct sock *  sk, struct group_filter *  gsf, struct group_filter *  optval, int *  optlen )

Definition at line 1938 of file igmp.c. References group_filter::gf_fmode, group_filter::gf_group, group_filter::gf_interface, group_filter::gf_numsrc, GROUP_FILTER_SIZE, MULTICAST, and sock::protinfo. Referenced by ip_getsockopt(). { int err, i, count, copycount; struct sockaddr_in *psin; u32 addr; struct ip_mc_socklist *pmc; struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_sf_socklist *psl; psin = (struct sockaddr_in *)&gsf->gf_group; if (psin->sin_family != AF_INET) return -EINVAL; addr = psin->sin_addr.s_addr; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == addr && pmc->multi.imr_ifindex == gsf->gf_interface) break; } if (!pmc) /* must have a prior join */ goto done; gsf->gf_fmode = pmc->sfmode; psl = pmc->sflist; rtnl_shunlock(); count = psl ? psl->sl_count : 0; copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; gsf->gf_numsrc = count; if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) { return -EFAULT; } for (i=0; i<copycount; i++) { struct sockaddr_in *psin; struct sockaddr_storage ss; psin = (struct sockaddr_in *)&ss; memset(&ss, 0, sizeof(ss)); psin->sin_family = AF_INET; psin->sin_addr.s_addr = psl->sl_addr[i]; if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss))) return -EFAULT; } return 0; done: rtnl_shunlock(); return err; }

void ip_mc_inc_group (  struct in_device *  in_dev, u32  addr )

Definition at line 1109 of file igmp.c. References in_device::dev, net_device::flags, igmp_group_added(), in_dev_hold, ip_mc_add_src(), ip_rt_multicast_event(), in_device::lock, in_device::mc_list, MCAST_EXCLUDE, and MCAST_INCLUDE. Referenced by ip_mc_join_group(), and ip_mc_up(). { struct ip_mc_list *im; ASSERT_RTNL(); for (im=in_dev->mc_list; im; im=im->next) { if (im->multiaddr == addr) { im->users++; ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, 0, 0); goto out; } } im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL); if (!im) goto out; im->users=1; im->interface=in_dev; in_dev_hold(in_dev); im->multiaddr=addr; /* initial mode is (EX, empty) */ im->sfmode = MCAST_EXCLUDE; im->sfcount[MCAST_INCLUDE] = 0; im->sfcount[MCAST_EXCLUDE] = 1; im->sources = 0; im->tomb = 0; im->crcount = 0; atomic_set(&im->refcnt, 1); spin_lock_init(&im->lock); #ifdef CONFIG_IP_MULTICAST im->tm_running=0; init_timer(&im->timer); im->timer.data=(unsigned long)im; im->timer.function=&igmp_timer_expire; im->unsolicit_count = IGMP_Unsolicited_Report_Count; im->reporter = 0; im->gsquery = 0; #endif im->loaded = 0; write_lock_bh(&in_dev->lock); im->next=in_dev->mc_list; in_dev->mc_list=im; write_unlock_bh(&in_dev->lock); #ifdef CONFIG_IP_MULTICAST igmpv3_del_delrec(in_dev, im->multiaddr); #endif igmp_group_added(im); if (in_dev->dev->flags & IFF_UP) ip_rt_multicast_event(in_dev); out: return; }

int ip_mc_join_group (  struct sock *  sk, struct ip_mreqn *  imr )

Definition at line 1579 of file igmp.c. References ip_mreqn::imr_multiaddr, ip_mc_find_dev(), ip_mc_inc_group(), MCAST_EXCLUDE, MULTICAST, sock::protinfo, in_addr::s_addr, sock_kfree_s(), sock_kmalloc(), and sysctl_igmp_max_memberships. Referenced by ip_setsockopt(), and join_mcast_group(). { int err; u32 addr = imr->imr_multiaddr.s_addr; struct ip_mc_socklist *iml, *i; struct in_device *in_dev; struct inet_opt *inet = &sk->protinfo.af_inet; int count = 0; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); in_dev = ip_mc_find_dev(imr); if (!in_dev) { iml = NULL; err = -ENODEV; goto done; } iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); err = -EADDRINUSE; for (i = inet->mc_list; i; i = i->next) { if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) { /* New style additions are reference counted */ if (imr->imr_address.s_addr == 0) { i->count++; err = 0; } goto done; } count++; } err = -ENOBUFS; if (iml == NULL || count >= sysctl_igmp_max_memberships) goto done; memcpy(&iml->multi, imr, sizeof(*imr)); iml->next = sk->protinfo.af_inet.mc_list; iml->count = 1; iml->sflist = NULL; iml->sfmode = MCAST_EXCLUDE; inet->mc_list = iml; ip_mc_inc_group(in_dev, addr); iml = NULL; err = 0; done: rtnl_shunlock(); if (iml) sock_kfree_s(sk, iml, sizeof(*iml)); return err; }

int ip_mc_leave_group (  struct sock *  sk, struct ip_mreqn *  imr )

Definition at line 1657 of file igmp.c. References ip_mreqn::imr_address, ip_mreqn::imr_ifindex, ip_mreqn::imr_multiaddr, in_dev_put(), inetdev_by_index(), ip_mc_dec_group(), ip_mc_leave_src(), sock::protinfo, rtnl_lock(), rtnl_unlock(), in_addr::s_addr, and sock_kfree_s(). Referenced by ip_setsockopt(). { struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_mc_socklist *iml, **imlp; rtnl_lock(); for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr && iml->multi.imr_address.s_addr==imr->imr_address.s_addr && (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) { struct in_device *in_dev; in_dev = inetdev_by_index(iml->multi.imr_ifindex); if (in_dev) (void) ip_mc_leave_src(sk, iml, in_dev); if (--iml->count) { rtnl_unlock(); if (in_dev) in_dev_put(in_dev); return 0; } *imlp = iml->next; if (in_dev) { ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr); in_dev_put(in_dev); } rtnl_unlock(); sock_kfree_s(sk, iml, sizeof(*iml)); return 0; } } rtnl_unlock(); return -EADDRNOTAVAIL; }

int ip_mc_leave_src (  struct sock *  sk, struct ip_mc_socklist *  iml, struct in_device *  in_dev )

Definition at line 1635 of file igmp.c. References ip_mc_del_src(), and sock_kfree_s(). Referenced by ip_mc_drop_socket(), and ip_mc_leave_group(). { int err; if (iml->sflist == 0) { /* any-source empty exclude case */ return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, iml->sfmode, 0, 0, 0); } err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, iml->sfmode, iml->sflist->sl_count, iml->sflist->sl_addr, 0); sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); iml->sflist = 0; return err; }

int ip_mc_msfget (  struct sock *  sk, struct ip_msfilter *  msf, struct ip_msfilter *  optval, int *  optlen )

Definition at line 1879 of file igmp.c. References ip_mreqn::imr_address, ip_mreqn::imr_ifindex, ip_mreqn::imr_multiaddr, ip_msfilter::imsf_fmode, ip_msfilter::imsf_interface, ip_msfilter::imsf_multiaddr, ip_msfilter::imsf_numsrc, ip_mc_find_dev(), IP_MSFILTER_SIZE, MULTICAST, sock::protinfo, and in_addr::s_addr. Referenced by ip_getsockopt(). { int err, len, count, copycount; struct ip_mreqn imr; u32 addr = msf->imsf_multiaddr; struct ip_mc_socklist *pmc; struct in_device *in_dev; struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_sf_socklist *psl; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; imr.imr_address.s_addr = msf->imsf_interface; imr.imr_ifindex = 0; in_dev = ip_mc_find_dev(&imr); if (!in_dev) { err = -ENODEV; goto done; } err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && pmc->multi.imr_ifindex == imr.imr_ifindex) break; } if (!pmc) /* must have a prior join */ goto done; msf->imsf_fmode = pmc->sfmode; psl = pmc->sflist; rtnl_shunlock(); if (!psl) { len = 0; count = 0; } else { count = psl->sl_count; } copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; len = copycount * sizeof(psl->sl_addr[0]); msf->imsf_numsrc = count; if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || copy_to_user((void *)optval, msf, IP_MSFILTER_SIZE(0))) { return -EFAULT; } if (len && copy_to_user((void *)&optval->imsf_slist[0], psl->sl_addr, len)) return -EFAULT; return 0; done: rtnl_shunlock(); return err; }

int ip_mc_msfilter (  struct sock *  sk, struct ip_msfilter *  msf, int  ifindex )

Definition at line 1810 of file igmp.c. References ip_mreqn::imr_address, ip_mreqn::imr_ifindex, ip_mreqn::imr_multiaddr, ip_msfilter::imsf_fmode, ip_msfilter::imsf_interface, ip_msfilter::imsf_multiaddr, ip_msfilter::imsf_numsrc, ip_msfilter::imsf_slist, ip_mc_add_src(), ip_mc_del_src(), ip_mc_find_dev(), MCAST_EXCLUDE, MCAST_INCLUDE, MULTICAST, sock::protinfo, in_addr::s_addr, sock_kfree_s(), and sock_kmalloc(). Referenced by ip_setsockopt(). { int err; struct ip_mreqn imr; u32 addr = msf->imsf_multiaddr; struct ip_mc_socklist *pmc; struct in_device *in_dev; struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_sf_socklist *newpsl, *psl; if (!MULTICAST(addr)) return -EINVAL; if (msf->imsf_fmode != MCAST_INCLUDE && msf->imsf_fmode != MCAST_EXCLUDE) return -EINVAL; rtnl_shlock(); imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; imr.imr_address.s_addr = msf->imsf_interface; imr.imr_ifindex = ifindex; in_dev = ip_mc_find_dev(&imr); if (!in_dev) { err = -ENODEV; goto done; } err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && pmc->multi.imr_ifindex == imr.imr_ifindex) break; } if (!pmc) /* must have a prior join */ goto done; if (msf->imsf_numsrc) { newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL); if (!newpsl) { err = -ENOBUFS; goto done; } newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; memcpy(newpsl->sl_addr, msf->imsf_slist, msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); if (err) { sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); goto done; } } else newpsl = 0; psl = pmc->sflist; if (psl) { (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, psl->sl_count, psl->sl_addr, 0); sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); } else (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 0, 0, 0); pmc->sflist = newpsl; pmc->sfmode = msf->imsf_fmode; done: rtnl_shunlock(); return err; }

int ip_mc_procinfo (  char *  buffer, char **  start, off_t  offset, int  length )

Definition at line 2091 of file igmp.c. References dev_base, dev_base_lock, net_device::ifindex, in_dev_get(), in_dev_put(), in_device::lock, net_device::mc_count, in_device::mc_list, net_device::name, and net_device::next. Referenced by ip_init(). { off_t pos=0, begin=0; struct ip_mc_list *im; int len=0; struct net_device *dev; len=sprintf(buffer,"Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); read_lock(&dev_base_lock); for(dev = dev_base; dev; dev = dev->next) { struct in_device *in_dev = in_dev_get(dev); char *querier = "NONE"; if (in_dev == NULL) continue; #ifdef CONFIG_IP_MULTICAST querier = IGMP_V1_SEEN(in_dev) ? "V1" : "V2"; #endif len+=sprintf(buffer+len,"%d\t%-10s: %5d %7s\n", dev->ifindex, dev->name, dev->mc_count, querier); read_lock(&in_dev->lock); for (im = in_dev->mc_list; im; im = im->next) { len+=sprintf(buffer+len, "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", im->multiaddr, im->users, im->tm_running, im->timer.expires-jiffies, im->reporter); pos=begin+len; if(pos<offset) { len=0; begin=pos; } if(pos>offset+length) { read_unlock(&in_dev->lock); in_dev_put(in_dev); goto done; } } read_unlock(&in_dev->lock); in_dev_put(in_dev); } done: read_unlock(&dev_base_lock); *start=buffer+(offset-begin); len-=(offset-begin); if(len>length) len=length; if(len<0) len=0; return len; }

int ip_mc_sf_allow (  struct sock *  sk, u32  loc_addr, u32  rmt_addr, int  dif )

Definition at line 1996 of file igmp.c. References MCAST_EXCLUDE, MCAST_INCLUDE, MULTICAST, and sock::protinfo. Referenced by udp_v4_mcast_next(). { struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_mc_socklist *pmc; struct ip_sf_socklist *psl; int i; if (!MULTICAST(loc_addr)) return 1; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == loc_addr && pmc->multi.imr_ifindex == dif) break; } if (!pmc) return 1; psl = pmc->sflist; if (!psl) return pmc->sfmode == MCAST_EXCLUDE; for (i=0; i<psl->sl_count; i++) { if (psl->sl_addr[i] == rmt_addr) break; } if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) return 0; if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) return 0; return 1; }

int ip_mc_source (  int  add, int  omode, struct sock *  sk, struct ip_mreq_source *  mreqs, int  ifindex )

Definition at line 1694 of file igmp.c. References ip_mreqn::imr_address, ip_mreqn::imr_ifindex, ip_mreq_source::imr_interface, ip_mreqn::imr_multiaddr, ip_mreq_source::imr_multiaddr, ip_mreq_source::imr_sourceaddr, ip_mc_add_src(), ip_mc_del_src(), ip_mc_find_dev(), MULTICAST, sock::protinfo, in_addr::s_addr, sock_kfree_s(), and sock_kmalloc(). Referenced by ip_setsockopt(). { int err; struct ip_mreqn imr; u32 addr = mreqs->imr_multiaddr; struct ip_mc_socklist *pmc; struct in_device *in_dev = 0; struct inet_opt *inet = &sk->protinfo.af_inet; struct ip_sf_socklist *psl; int i, j, rv; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; imr.imr_address.s_addr = mreqs->imr_interface; imr.imr_ifindex = ifindex; in_dev = ip_mc_find_dev(&imr); if (!in_dev) { err = -ENODEV; goto done; } err = -EADDRNOTAVAIL; for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0) break; } if (!pmc) /* must have a prior join */ goto done; /* if a source filter was set, must be the same mode as before */ if (pmc->sflist) { if (pmc->sfmode != omode) goto done; } else if (pmc->sfmode != omode) { /* allow mode switches for empty-set filters */ ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 0, 0); pmc->sfmode = omode; ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 0, 0); } psl = pmc->sflist; if (!add) { if (!psl) goto done; rv = !0; for (i=0; i<psl->sl_count; i++) { rv = memcmp(&psl->sl_addr, &mreqs->imr_multiaddr, sizeof(__u32)); if (rv >= 0) break; } if (!rv) /* source not found */ goto done; /* update the interface filter */ ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, &mreqs->imr_sourceaddr, 1); for (j=i+1; j<psl->sl_count; j++) psl->sl_addr[j-1] = psl->sl_addr[j]; psl->sl_count--; err = 0; goto done; } /* else, add a new source to the filter */ if (!psl || psl->sl_count == psl->sl_max) { struct ip_sf_socklist *newpsl; int count = IP_SFBLOCK; if (psl) count += psl->sl_max; newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); if (!newpsl) { err = -ENOBUFS; goto done; } newpsl->sl_max = count; newpsl->sl_count = count - IP_SFBLOCK; if (psl) { for (i=0; i<psl->sl_count; i++) newpsl->sl_addr[i] = psl->sl_addr[i]; sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); } pmc->sflist = psl = newpsl; } rv = 1; /* > 0 for insert logic below if sl_count is 0 */ for (i=0; i<psl->sl_count; i++) { rv = memcmp(&psl->sl_addr, &mreqs->imr_multiaddr, sizeof(__u32)); if (rv >= 0) break; } if (rv == 0) /* address already there is an error */ goto done; for (j=psl->sl_count-1; j>=i; j--) psl->sl_addr[j+1] = psl->sl_addr[j]; psl->sl_addr[i] = mreqs->imr_sourceaddr; psl->sl_count++; err = 0; /* update the interface list */ ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, &mreqs->imr_sourceaddr, 1); done: rtnl_shunlock(); return err; }

void ip_mc_up (  struct in_device *  in_dev  )

Definition at line 1222 of file igmp.c. References igmp_group_added(), ip_mc_inc_group(), in_device::mc_list, in_device::mc_lock, in_device::mc_tomb, in_device::mr_gq_running, in_device::mr_gq_timer, in_device::mr_ifc_count, in_device::mr_ifc_timer, and in_device::mr_qrv. Referenced by inetdev_event(), and inetdev_init(). { struct ip_mc_list *i; ASSERT_RTNL(); in_dev->mc_tomb = 0; #ifdef CONFIG_IP_MULTICAST in_dev->mr_gq_running = 0; init_timer(&in_dev->mr_gq_timer); in_dev->mr_gq_timer.data=(unsigned long) in_dev; in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; in_dev->mr_ifc_count = 0; init_timer(&in_dev->mr_ifc_timer); in_dev->mr_ifc_timer.data=(unsigned long) in_dev; in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; #endif in_dev->mc_lock = RW_LOCK_UNLOCKED; ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); for (i=in_dev->mc_list; i; i=i->next) igmp_group_added(i); }

int ip_mcf_procinfo (  char *  buffer, char **  start, off_t  offset, int  length )

Definition at line 2149 of file igmp.c. References dev_base, dev_base_lock, net_device::ifindex, in_dev_get(), in_dev_put(), in_device::lock, in_device::mc_list, MCAST_EXCLUDE, MCAST_INCLUDE, net_device::name, and net_device::next. Referenced by ip_init(). { off_t pos=0, begin=0; int len=0; int first = 1; struct net_device *dev; read_lock(&dev_base_lock); for(dev=dev_base; dev; dev=dev->next) { struct in_device *in_dev = in_dev_get(dev); struct ip_mc_list *imc; if (in_dev == NULL) continue; read_lock(&in_dev->lock); for (imc=in_dev->mc_list; imc; imc=imc->next) { struct ip_sf_list *psf; spin_lock_bh(&imc->lock); for (psf=imc->sources; psf; psf=psf->sf_next) { if (first) { len += sprintf(buffer+len, "%3s %6s " "%10s %10s %6s %6s\n", "Idx", "Device", "MCA", "SRC", "INC", "EXC"); first = 0; } len += sprintf(buffer+len, "%3d %6.6s 0x%08x " "0x%08x %6lu %6lu\n", dev->ifindex, dev->name, ntohl(imc->multiaddr), ntohl(psf->sf_inaddr), psf->sf_count[MCAST_INCLUDE], psf->sf_count[MCAST_EXCLUDE]); pos=begin+len; if(pos<offset) { len=0; begin=pos; } if(pos>offset+length) { spin_unlock_bh(&imc->lock); read_unlock(&in_dev->lock); in_dev_put(in_dev); goto done; } } spin_unlock_bh(&imc->lock); } read_unlock(&in_dev->lock); in_dev_put(in_dev); } done: read_unlock(&dev_base_lock); *start=buffer+(offset-begin); len-=(offset-begin); if(len>length) len=length; if(len<0) len=0; return len; }

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Variable Documentation

int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS

Definition at line 1304 of file igmp.c. Referenced by ip_mc_join_group().

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